Tourbillon is an addition to the mechanics of a watch escapement. Developed around 1795 by the French-Swiss watchmaker Abraham-Louis Breguet from an earlier idea by the English chronometer maker John Arnold, a tourbillon aims to counter the effects of gravity by mounting the escapement and balance wheel in a rotating cage, to negate the effect of gravity when the timepiece (thus the escapement) is stuck in a certain position.

Harry Winston Histoire De Tourbillon 7 Watch - more on aBlogtoWatch.com "The Histoire de Tourbillon series is going to get Harry Winston in trouble. Seeing how every iteration of this series of incredible legacy watches has gotten exponentially more and more complex every year, we’re starting to wonder how on Earth will they be able to deliver something that can up the ante from the previous version. Still, it doesn't look like 2016 will be the year the Histoire De Tourbillon plateaued..."